(NaturalNews) You might be reassured to learn that the buttery flavor in microwave popcorn typically comes from a chemical actually found in butter, but you shouldn’t be. This chemical, called diacetyl, is so toxic that it commonly destroys the lungs of workers in microwave popcorn factories, afflicting them with the crippling and irreversible disease known as bronchiolitis obliterans. Bronchiolitis obliterans is so rare outside of this context that it has become more commonly known as “popcorn lung,” after the primary cause of the disease.

Regulators and health professionals have known of this risk for decades, but always assumed that it would only affect people breathing in especially high concentrations in factory settings. Then in 2007, a man who regularly ate two bags of microwave popcorn every day was diagnosed with popcorn lung, indicating that diacetyl enters the air and lungs when microwave popcorn is cooked. Anxious to reassure consumers, most microwave popcorn companies phased out diacetyl — only to replace it with chemicals that have the same effects.

Today, you can still find diacetyl in many flavored snack foods and even in some so-called “natural” foods. Make sure you read the ingredients of any food you intend to consume, and make sure it contains no diacetyl (and no “yeast extract” for that matter, either).

Source: 25 Amazing Facts About Food, authored by Mike Adams and David Guiterrez. This report reveals surprising things about where your food comes from and what’s really in it! Download the full report (FREE) by clicking here. Inside, you’ll learn 24 more amazing but true facts about foods, beverages and food ingredients. Instant download of the complete PDF. All 25 facts are documented and true.